28350409 has 4 divisors (see below), whose sum is σ = 28377216. Its totient is φ = 28323604.

The previous prime is 28350403. The next prime is 28350431. The reversal of 28350409 is 90405382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28350409 - 2¹⁹ = 27826121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28350403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11749 + ... + 13954.

It is an arithmetic number, because the mean of its divisors is an integer number (7094304).

Almost surely, 2^28350409 is an apocalyptic number.

It is an amenable number.

28350409 is a deficient number, since it is larger than the sum of its proper divisors (26807).

28350409 is a wasteful number, since it uses less digits than its factorization.

28350409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26806.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28350409 is about 5324.5102122167. The cubic root of 28350409 is about 304.9203733729.

The spelling of 28350409 in words is "twenty-eight million, three hundred fifty thousand, four hundred nine".